run-tests.sh: exact string match for --test=<name> option
David 'Digit' Turner authored
This patch ensures that run-tests.sh uses an exact match.
Before that, when using --test=test-stlport, it would
try to run both test-stlport-rtti and test-stlport

Change-Id: Id67e0e783b559639240d49f6c6803f5e71b1c065
bcb316b0